Add customary 'fork me on github' banner to website

doc/index.html

@@ -32,6 +32,8 @@
         <a href="#download" class="button" id="downloadbutton">Download</a>
         <a href="api/" class="button" id="docsbutton">Docs</a>
         <p class="version">__VERSION__</p> 
+
+        <a href="http://github.com/joyent/node"><img class="forkme" src="https://a248.e.akamai.net/camo.github.com/abad93f42020b733148435e2cd92ce15c542d320/687474703a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f677265656e5f3030373230302e706e67" alt="Fork me on GitHub"></a>
     </div>
     <div id="quotes" class="clearfix">
         <h2>Node.js in the Industry</h2>

doc/pipe.css

@@ -99,10 +99,19 @@ h1 a, h2 a, h3 a, h4 a
   border-radius: 4px;
   margin: 0 1px;
   color: #46483e;
+  background-color: #9a9f8b;
+}
+
+#intro .forkme {
+  position: absolute;
+  top: 0;
+  right: 0;
+  border: 0;
 }
 
 #intro .button:hover {
   text-decoration: none;
+  background-color: #aab293;
 }
 
 #intro #downloadbutton {
@@ -113,14 +122,6 @@ h1 a, h2 a, h3 a, h4 a
   background-color: #73a53e;
 }
 
-#intro #docsbutton {
-  background-color: #9a9f8b;
-}
-
-#intro #docsbutton:hover {
-  background-color: #aab293;
-}
-
 #quotes {
     text-align: center;
     width: 100%;